<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    * {
      margin: 0;
      padding: 0;
    }


    .smallpic {
      width: 500px;
      height: 500px;
      border: 1px solid gray;
      position: absolute;
      top: 100px;
      left: 100px;
    }

    .smallpic>img {
      width: 500px;
      height: 500px;
    }


    .zoom {
      width: 150px;
      height: 150px;
      background: yellow;
      opacity: 0.5;
      position: absolute;
      top: 0;
      left: 0;
      display: none;
    }


    .bigpic {
      width: 500px;
      height: 500px;
      background: url("./img1.png");
      border: 2px solid gray;
      position: absolute;
      top: 100px;
      left: 600px;
      display: none;
    }

    .small {
      position: absolute;
      width: 500px;
      height: 100px;
      background-color: skyblue;
      left: 100px;
      top: 600px;
      margin-top: 10px;
    }

    .small>ul>li>img {
      width: 100px;
      height: 100px;
    }

    .small>ul>li {
      display: inline-block;
      margin: 0 30px;

    }
  </style>
</head>

<body>
  <div class="smallpic">
    <img src="./img1.png">
    <div class="zoom"></div>
  </div>
  <div class="bigpic"></div>
  <div class="small">
    <ul>
      <li><img src="./img1.png" alt=""></li>
      <li><img src="./img2.png" alt=""></li>
      <li><img src="./img3.png" alt=""></li>
    </ul>
  </div>


</body>

</html>